I could see this:

Luke agrees to train Rey but quickly realizes that she is potentially too powerful and dangerous, so he only trains her in ways to control herself. At first Rey is thankful for that but becomes disillusioned and feels that Luke is stunting her growth and denying her destiny. She grows in power and a conflict brings her physically close enough to Kylo that he has a chance to seduce her with the promise of the training that she needs to unlock her potential. She believes that she is strong enough to use her power wisely, and that she isn't going any further with Luke, so she agrees to go with him. Luke freaks out and decides that he must kill them both as quickly as possible or they will grow too powerful to stop.

In the next movie Luke hunts down Kylo and Rey. They have been training together rigorously. Luke finds them. By that time Kylo has Rey convinced that Luke means to kill them (which is true) and Kylo stations Rey at a distance telling her that killing Luke is a major test in her training that she must pass. Luke fights Rey and drives her closer to Kylo's location. Once the three of them are relatively close together Luke presses her in order to kill her and get to Kylo, sensing that Kylo will stay out of it so that Rey can pass her test. During the fight Luke and Kylo trade comments from the Light and Dark perspective while Rey ponders both of their points of view. Rey eventually disables Luke and brings him near to death but stops the fight. At that point she turns on Kylo, realizing that she isn't being served by either Luke or Kylo. Rey battles and kills Kylo. Luke dies from his wounds and turns into a force ghost. Rey passes her test and fully becomes a Grey Jedi.

Full disclosure: I've been drinking rum and Cokes since I got home from work. I'll come back tomorrow to see if anything I posted makes sense.

Beer was my drug of choice tonight. Hence the "Poo" Dameron comment that I thought was clever at the time.

I laughed.

**** you jj this is how you reinvent Star Wars.

I'm late to the discussion but is the mechanical hand reaching out from the burning wreckage misdirection or a flashback?

The hand is a right hand. Luke has a mechanical right hand, but it appears R2D2 and Luke are approaching the burning structure proceeding the shot of the hand. My assumption is that it is misdirection and the order of these shots is reversed.

I'm not familiar enough with the universe, but can one of you with more expertise think of any other characters that would have this characteristic? Obviously, Vader did. The burning building is quite large and domed, similar to the building designs from the prequels too.

It appears to be a scene related of the Rey's "Forceback" in TFA, in which we see Luke & R2 witnessing the fiery destruction of his new Jedi Temple.

But recently, it's been speculated (by me as well), that parts of Rey's "Forceback" could be future events.

Where this scene lies in the timeline is up for debate at this point.

I can't say I'm a huge fan of Luke being a fractured bitch.

This isn't exactly what I've been waiting 30 years to see...

That would be incredible.

Does Disney have the stones to pull that stunt? They've put so much into building up Rey that I can't see any way they'd make her the chief antagonist of IX, especially not when they're getting so much positive pub for having a strong female lead.

I'm not excited at all about Luke appearing to be this broken down husk of a spooked hermit. Your turn there would be friggen amazing. They can't send Luke out like this...

Disney isn't going to sell millions of Jedi Rey dolls to kids and then turn around and make her a traitorous villain....

I think it's possible that Luke is talking about Rey when he says "I've seen this kind of raw power before and I wasn't afraid of it then, but I am now".

I also think it's possible that Rey was dropped off on Jakku, not to protect her, but to protect the galaxy.

I doubt they have the balls to pull that off, especially since JJ Abrams is co-writing and directing Episode IX. He tends to go all "Speilbergy" with his writing and directing.

But one thing that can't happen, IMO, is the redemption of Kylo Ren.

There's no reason for that to happen and he needs to die.

I'm ok with the whole Ray/Kylo thing. It seems they're both the new emphasis.

But I don't see why Luke has to be a shell-shocked character.

I hope there's a lot of misdirection in this trailer and that's not how it plays out...

Well, it appears that Luke has done a lot of research in regards to the Jedi Order and he has a copy of the Journal of the Whills, which existed on Jedha and had protectors such as Chirrut Imwe and Baze Malbus, both of whom appeared in Rogue One.

Luke may have realized that this is either part of a prophesy that he read about or that Rey is actually a physical manifestion of The Force itself, with unlimited power.

Whatever the case, Luke has apparently gained knowledge since first witnessing this power, which is why he's shell-shocked.

I'm sure there's a lot of that happening because they don't want to give anything away.

FWIW, I think everyone in the trailer is speaking to Rey.

I think Rey is going to run off against Luke's wishes and get herself into hot water...and Luke is going to come charging in to save the day, against his own advice.

It would be so true to the character. And an epic third act.

And remember how intent Snoke is on finding Luke...